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Author Topic: My review of Avalon 841 .  (Read 1386 times)
yxt
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May 07, 2018, 10:37:06 PM
 #101

anyone checked hardware errors on these various voltage settings?  Add up the HW[] values in the log output.  I suspect they will be rather high on the dramatic voltage changes.  Hash rate is raw and will include all the errors

For some reason Canaan support told me HW is not hardware errors and that values there don't matter. I have hundreds in 24H period with factory settings.

The reason is that this number means nothing Wink

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akadamson
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May 07, 2018, 11:41:12 PM
 #102

anyone checked hardware errors on these various voltage settings?  Add up the HW[] values in the log output.  I suspect they will be rather high on the dramatic voltage changes.  Hash rate is raw and will include all the errors

For some reason Canaan support told me HW is not hardware errors and that values there don't matter. I have hundreds in 24H period with factory settings.

I typically see approx 1% can be as high as 1.5%, doesn't matter if 841, or 821
philipma1957
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Avalon 841 rocks


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May 11, 2018, 11:57:21 PM
 #103

I got some more avalon 841 in and a sorcerer psu  and will do a few tests with them.

############################################################
############################################################
watts 1279
hash  12654
temp © 32/72
fans  100%

room temp 82f

but gear is near an ac vent which highs to cool off gear.

more options setting is below
--avalon8-voltage-level -1

time of test is 1h 24m 53s

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

More Options setting of next test is
--avalon8-voltage-level -5

this is the lowest test I have tried to date
watts 1012
hash ---------waiting for hash rate to settle in
temp © 30/67
fans 81%
room temp 82f

time will do at least 1 hr

the - 5  setting seems to be as low as I can clock
full size images





hash 8500
watts 950
temp© 29 / 65
fans 61%
room temp
time  9h 6m 12s





I took some photos of this test bed setup note room is 83f but it is taken on top of a tv setup and reads high.  I placed the psu to get cooling from an ac vent.

watts 950


temp is at 6 foot height about 9 feet away from gear


gear note corsair ax1500i psu


note ac vent which does push some cool air towards psu



8500 using 950 watts is about 0.111 watts a gh the point of tests like this is to show work arounds it means you could use any 1200 watt atx psu in a pinch even with 120 volt power.
it also allows for use in a hot space during the summer.
this gear should not have overheating issues at this setting if you area to mine is fan cooled  and runs warm in the summer  this setting should work for you.


here are the five under clocks  that work for me

--avalon8-voltage-level -1
--avalon8-voltage-level -2
--avalon8-voltage-level -3
--avalon8-voltage-level -4
--avalon8-voltage-level -5   lowest numbers      8500 hash at 950 watts runs very cool


the 2 below did weird shit and acted like overclocks not under clocks
--avalon8-voltage-level -6
--avalon8-voltage-level -8



Moderator's note: This post was edited by frodocooper to reduce the size of the embedded images and to remove unnecessary whitespace.

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May 12, 2018, 07:43:15 PM
 #104

Hi,

Thanks for sharing, do you any tests on the safest overclock settings suitable for situations where heat is not an issue nor electricity costs?

Thanks.



Moderator's note: This post was edited by frodocooper to remove an unnecessary quote.

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philipma1957
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May 12, 2018, 08:45:52 PM
 #105

I have yet to try over clock modes.

I simply don't  have the cooling available.

I know that  in a 67f room  which I can't do again until it gets cold outside  I got my best results

I am pretty sure   in a 60f room  you can do an overclock and get 14th with good numbers
I am certain in a 50f room  you can do an overclock and gt 14.2 th with good numbers.

But I can't create that environment unit the fall.

there have to be some people with a good psu  that will do 2400 watts such as the delta sold by parallel miner
or the hp 2450 watt psu that can do a solid over clock in a cool room.

EDIT  it is mom's day and I guess ogombil's mom wants some numbers for overclock
we had a t-storm and this morning it is 55f so I am doing some overclock

i did not get above 13900 using  any setting

my best was

watts 1414
hash 13900
temp© 20/69

on --avalon8-voltage-level-offset +1

note to be sure I had lots of psu overhead I did 2 bitmain apw3++ which were using 240 volts and 1414 watts since they can provide close to 3000 volts I had lots of overhead.

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ogombii
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May 14, 2018, 09:09:20 PM
 #106

EDIT  it is mom's day and I guess ogombil's mom wants some numbers for overclock
we had a t-storm and this morning it is 55f so I am doing some overclock

i did not get above 13900 using  any setting

my best was

watts 1414
hash 13900
temp© 20/69

on --avalon8-voltage-level-offset +1

note to be sure I had lots of psu overhead I did 2 bitmain apw3++ which were using 240 volts and 1414 watts since they can provide close to 3000 volts I had lots of overhead.

Top Man!

Thanks for the proof of concept, I tried replicating your test, similar results.  I guess its best to leave on default(--avalon8-voltage-level-offset 0), I get roughly 13700 @ 21/65 and 13550 @19/66 for the other 841.

Thank you very much

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May 16, 2018, 11:26:12 PM
 #107

Well this is working out well....
Today just got another A841 in from Blockforge, also was able to add my last of 6 741's to the main farm and wadda ya know... One of my T9's has a board that went titsup so took it offline. Worse is that a batch-11 s9 I have as a 'spare' seems to want to run hotter than the hubs of hell, lord knows what the power draw is. Even underclocked to 533 temps are still around 100-105C.
Woof. All in the timing I guess
Anywho, good timing for the A8 to arrive! Taking the hot s9 back offline and replacing with the 841. Keep this up and soon most of my farm with be Avalons

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